Today I found this great tool:
http://www.labnol.org/google-adsense-sandbox/
It enables you to view which Adsense banners are shown in certain countries.
The great thing about that is that you can see different targeting per country. For instance: I’m living in The Netherlands which means that my targeting is in the best case some link to Nissan or Toyota dealers. Not a really good targeting IMO.
However if I’m looking at what people from the US receive makes me a bit more happy: “Initial D ringtones”, “Nissan Skyline R34 for sale”, “Nitrox RC cars”. :)
And I just removed the larger Google Adsense banner two days ago in favor for Yesasia.com banners… :(